Answer:
The Moon's phases repeat every 29.5 days, but it's orbit around the Earth only takes 27.
Explanation:
Why? In that time, as our Moon moves around Earth, the Earth also moves around the Sun. Our Moon must travel a little farther in its path to make up for the added distance and complete its phase cycle.
Answer:
the earth surface is constantly changing from force in nature the daily process of precipitation wind and land moments result in changes to landforms over a long period of time driving forces into rows and volcanoes and earthquakes people also contribute to changes in the appearance of land
The only legitimate basis for the formation of a state is the nation.
Explanation:
The formation of a state can be an easy or a very complicated process. Also, it can be done in a peaceful manner, or through usage of violence and military action. The states have been formed in many different ways over the course of the history. The principle of self-determination though states that the only legitimate basis for the formation of a state is the nation.
- This principle seems good and legit, but in practice has turned out to be very problematic.
- Numerous states have been formed without really having a nation, but more a mixture of different people and cultures stuffed together without even asking them for it.
- There a re lot of nations around the world that do not have states, or rather are not allowed to have states, such as the Basques, Catalans, Kurdish etc.
- Some states have been formed because of the interest of other states, like the example of Kosovo in the Balkans.
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A radioactive element with a half-life of 1,000 years, and starting mass of 20 grams, will need 2,000 years to decrease to 5 grams.
Explanation:
The radioactive elements all have a specific half-life. Each element's half-life is well known, and they are used by scientists of numerous fields as they are excellent for determining the age of a particular item, be it or organic or non-organic nature. In this case, we have a radioactive element with a half-life of 1,000 years, and starting mass of 20 grams.
The half-life basically means that half of the mass of an element is lost during a particular period of time. For the element in question we need to find out how much time will be needed for it to decrease to 5 grams. In order to get to the result, we just need to add 1,000 years on every decrease of half of the mass:
20/2 = 10
10/2 = 5
So in 1,000 years, the element in question will decrease to 10 grams, and in further 1,000 years (2,000 cumulatively) it will decrease to 5 grams.
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